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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ipolytech</journal-id><journal-title-group><journal-title xml:lang="ru">iPolytech Journal</journal-title><trans-title-group xml:lang="en"><trans-title>iPolytech Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-4004</issn><issn pub-type="epub">2782-6341</issn><publisher><publisher-name>Irkutsk National Research Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21285/1814-3520-2024-2-247-260</article-id><article-id custom-type="edn" pub-id-type="custom">XKQPGA</article-id><article-id custom-type="elpub" pub-id-type="custom">ipolytech-824</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭНЕРГЕТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>POWER ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Исследование влияния несбалансированности нагрузок сети низкого напряжения на потокораспределение в сети среднего напряжения</article-title><trans-title-group xml:lang="en"><trans-title>Effects of unbalanced loads in a low-voltage network on flow distribution in a medium-voltage network</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Войтов</surname><given-names>О. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Voitov</surname><given-names>O. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Войтов Олег Николаевич, к.т.н., доцент, старший научный сотрудник отдела электроэнергетических систем</p><p>664033, г. Иркутск, ул. Лермонтова, 130</p></bio><bio xml:lang="en"><p>Oleg N. Voitov, Cand. Sci. (Eng.), Associate Professor, Senior Researcher of the Department  of Electric Power Systems</p><p>130, Lermontov St., Irkutsk 664033</p></bio><email xlink:type="simple">sdo@isem.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Голуб</surname><given-names>И. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Golub</surname><given-names>I. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Голуб Ирина Ивановна, д.т.н., профессор, ведущий научный сотрудник отдела электроэнергетических систем</p><p>664033, г. Иркутск, ул. Лермонтова, 130</p></bio><bio xml:lang="en"><p>Irina I. Golub, Leading Researcher of the Department  of Electric Power Systems</p><p>130, Lermontov St., Irkutsk 664033</p></bio><email xlink:type="simple">golub@isem.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Семенова</surname><given-names>Л. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Semenova</surname><given-names>L. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Семенова Людмила Васильевна, научный сотрудник отдела электроэнергетических систем</p><p>664033, г. Иркутск, ул. Лермонтова, 130</p></bio><bio xml:lang="en"><p>Luydmila V. Semenova, Researcher of the Department  of Electric Power Systems</p><p>130, Lermontov St., Irkutsk 664033</p></bio><email xlink:type="simple">cdo@isem.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Карпова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Karpova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Карпова Елена Валерьевна, аспирант</p><p>664033, г. Иркутск, ул. Лермонтова, 130</p></bio><bio xml:lang="en"><p>Elena V. Karpova, Postgraduate Student</p><p>130, Lermontov St., Irkutsk 664033</p></bio><email xlink:type="simple">karpova.e.v.96@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бучинский</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Buchinsky</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бучинский Анатолий Леонидович, заместитель генерального директора по транспорту электроэнергии </p><p>664075, г. Иркутск, ул. Ширямова, д. 54, а/я 52</p></bio><bio xml:lang="en"><p>Anatoly L. Buchinsky, Deputy General Director  for Power Transportation</p><p>54 Shiryamov St., Irkutsk 664075, P.O. Box 52</p></bio><email xlink:type="simple">buchinskiy@oblkomenergo.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт систем энергетики им. Л.А. Мелентьева СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Melentiev Energy Systems Institute SB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ОГУЭП «Облкоммунэнерго»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Regional State Unitary Energy Enterprise «Oblkommunenergo»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>04</day><month>07</month><year>2024</year></pub-date><volume>28</volume><issue>2</issue><fpage>247</fpage><lpage>260</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Войтов О.Н., Голуб И.И., Семенова Л.В., Карпова Е.В., Бучинский А.Л., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Войтов О.Н., Голуб И.И., Семенова Л.В., Карпова Е.В., Бучинский А.Л.</copyright-holder><copyright-holder xml:lang="en">Voitov O.N., Golub I.I., Semenova L.V., Karpova E.V., Buchinsky A.L.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://ipolytech.elpub.ru/jour/article/view/824">https://ipolytech.elpub.ru/jour/article/view/824</self-uri><abstract><p>Цель исследований заключалась в решении проблемы повышения точности расчета потокораспределения в распределительной сети среднего напряжения на основе измерений балансовых интеллектуальных счетчиков, размещенных на вторичной стороне трансформаторов 6(10)/0,4 кВ.  Для учета влияния несбалансированности нагрузок в сети низкого напряжения на потокораспределение в сети среднего напряжения использовалось приведение трехфазных трехпроводных линий к однолинейному представлению, которое позволяет применять для расчета несимметричного режима программы расчета симметричных режимов. Определение нагрузок сети среднего напряжения осуществлялось добавлением к нагрузкам, измеренным на вторичной стороне трансформаторов, потерь мощности в обмотках и в сердечнике трансформатора. Расчет потерь мощности в обмотках с использованием методов фазных координат и симметричных составляющих включает определение токов в обмотках каждой фазы по 48 срезам измерений мощностей нагрузок и модулей напряжений, выполненных балансовым счетчиком в течение суток. Показано, что корректность выражений для расчета потерь мощности в обмотках трансформаторов подтверждается равенством суммарных потерь в фазных координатах и симметричных составляющих. Установлено, что потери мощности обратной последовательности в обмотках трансформаторов близки к нулю, а потери нулевой последовательности существенно меньше потерь прямой последовательности практически для всех трансформаторов со схемой соединения обмоток звезда/звезда с нулем, независимо от коэффициента загрузки и номинальной мощности. Таким образом, в результате проведенных исследований были доказаны возможность и эффективность использования измерений балансовых счетчиков для определения нагрузок и расчета потокораспределения сети среднего напряжения, что проиллюстрировано для реальной распределительной сети, включающей 26 трансформаторов. Проведенные исследования показали необходимость уточнения математических моделей трансформаторов при совместном расчете распределительных сетей среднего и низкого напряжений. </p></abstract><trans-abstract xml:lang="en"><p>We address the problem of improving the calculation accuracy of power flow in a medium-voltage distribution network based on the measurements of smart meters installed on the secondary side of 6(10)/0.4 kV transformers. In order to account for the effect of unbalanced loads in the low-voltage network on power flow in the medium-voltage network, three-phase three-wire lines were reduced to a single-line option. This enabled the use of symmetric mode calculation programs for the asymmetric mode. The loads in the medium-voltage network were determined by adding power losses in transformer windings and core to the loads measured on the secondary side of transformers. The calculation of winding power losses using the methods of phase coordinates and symmetrical components involves determination of currents in the windings of each phase according to 48 sections of load capacity and voltage module measurements, performed by the smart meter during the day. The correctness of expressions for calculating power losses in transformer windings is confirmed by the equality of total losses in phase coordinates and symmetrical components. The negative sequence power losses in transformer windings were found to be close to zero, while zero sequence losses are significantly lower than the positive sequence losses for almost all transformers with a double star-zero winding connection scheme, regardless of the load factor and rated power. The conducted studies confirmed the possibility and effectiveness of using smart meter measurements for determining loads and calculating power flow in the medium-voltage network. This conclusion was illustrated using an actual distribution network with 26 transformers. Future research should aim to clarify the mathematical models of transformers in the joint calculation of medium- and low-voltage distribution networks.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>распределительная сеть</kwd><kwd>интеллектуальные балансные счетчики</kwd><kwd>несбалансированность нагрузок</kwd><kwd>потокораспределение</kwd><kwd>фазные координаты</kwd><kwd>симметричные составляющие</kwd></kwd-group><kwd-group xml:lang="en"><kwd>distribution network</kwd><kwd>smart balanced meters</kwd><kwd>load imbalance</kwd><kwd>load flow</kwd><kwd>phase coordinates</kwd><kwd>symmetrical components</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках проекта государственного задания (№ FWEU-2021-0001) программы фундаментальных исследований РФ на 2021–2030 гг.</funding-statement><funding-statement xml:lang="en">The research was carried out under the State Assignment Project (no. FWEU-2021-0001) of the Fundamental Research Program of the Russian Federation for the period from 2021 to 2030.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Golub I., Boloev E. Determination of losses in distribution networks by smart meter measurements // International Conference on Electrical, Communication, and Computer Engineering. 2021. https://doi.org/10.1109/ICECCE52056.2021.9514102. EDN: ASHCFA.</mixed-citation><mixed-citation xml:lang="en">Golub I., Boloev E. Determination of losses in distribution networks by smart meter measurements. In: International Conference on Electrical, Communication, and Computer Engineering. 2021. https://doi.org/10.1109/ICECCE52056.2021.9514102. 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